See one-minute video on BBC
NASA Connect Segment explaining the development of the US standard system of measurement and the metric system and how the two systems differ.
Imperial UK -US systems : units of length, area, mass or weight, capacity, volume, coins and notes of Old money,
The Metric system : units, definition and history
History og length measurement.
*** Converting measurements : GCSE BBC (See pages 1 and 2).
*** Useful conversion facts between the two systems (and exercises : Plymouth.ac.uk)
Will British people ever think in metric ? BBC article.
Safety concerns as EU orders UK railways go metric : article (2015).
Why do we still have Imperial measurements ? BBC video from Mathematician and comedian Matt Parker.
*** Symmetry, reality's riddles by Marcus du Sautoy, Oxford *****
*** Music and symmetry with Marcus du Sautoy *** MAJ 7 janvier 2017